The Association of American Railroads (AAR) is an association of railroads which includes among its members ail of the large freight railroads in Canada, the United Stares and Mexico as well as passenger railroads that operate the U.S. intercity passenger trains and that provide commuter rail service.
La Association of American Railroads (AAR) es una asociación de ferrocarriles a la que están afiliadas todas las grandes empresas de transporte ferroviario de mercancías del Canadá, los Estados Unidos y México, así como las de transporte de pasajeros que administran los trenes interurbanos de los Estados Unidos y prestan servicios de enlace ferroviario regular.